diff --git a/autogen/config.in b/autogen/config.in
index 603101f51bf..8e18d1c9206 100644
--- a/autogen/config.in
+++ b/autogen/config.in
@@ -1554,7 +1554,8 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 # if (__GNUC__ == 4 && 6 <= __GNUC_MINOR__) || 4 < __GNUC__
 #  define _GL_INLINE_HEADER_BEGIN \
      _Pragma ("GCC diagnostic push") \
-     _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"")
+     _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
+     _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"")
 #  define _GL_INLINE_HEADER_END \
      _Pragma ("GCC diagnostic pop")
 # endif